[Config]: Change preset configuration to accept multiple presets at the same time

[c0nst4ntin]

As discussed in the following pull request, we should consider making the presets config an array, so people can combine different presets:

• Add stubs for ISO 4217 and ISO 3166 alpha-2 and alpha-3 #129

Example:

{
    "presets": ["laravel", "iso4217", "iso3166"],
    // ...
}

[julio-cavallari]

Hi @c0nst4ntin, I created a first version about this discussion, it is in this PR

[Config] Multiple presets in config